硝酸盐自然循环回路熔盐空气热交换器风冷通道内流场特性分析  

Analysis of natural circulation flow field inside the air-cooled channel of molten salt-air heat exchanger in the nitrate natural circulation loop

作　　者：侯祯 蔡创雄[1] 张亚朋 杨群[1] 何兆忠[1] 陈堃[1] HOU Zhen;CAI Chuangxiong;ZHANG Yapeng;YANG Qun;HE Zhaozhong;CHEN Kun(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Jiading Campus,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海应用物理研究所嘉定园区,上海201800 [2]中国科学院大学,北京100049

出　　处：《核技术》2018年第10期68-74,共7页Nuclear Techniques

基　　金：中国科学院战略性先导科技专项项目(No.XDA02050100)资助~~

摘　　要：硝酸盐自然循环回路(Nitrate Natural Circulation Loop, NNCL)是研究熔盐堆非能动余热排出技术的实验平台,通过熔盐非能动循环和风冷通道内的空气自然对流将热量排至大气。研究熔盐-空气热交换器风冷通道内的流场特性,可以深入了解NNCL自然循环的建立过程及有效性。采用数值模拟方法对NNCL熔盐-空气热交换器的风冷通道内的空气速度场和温度场分布进行研究,分析不同时刻风冷通道内的流场特性,获得了风门不同开启程度条件下,风冷通道内的温度场和速度场分布及变化规律。研究结果表明:NNCL的空气流道在风门开启后,可以很好地形成空气自然循环,并使换热器形成熔盐自然循环,带走热量。本研究弥补了NNCL流场分布实验条件的不足,为NNCL自然循环建立的有效性和稳定性提供了参考依据。[Background] The application of passive safety systems can contribute to security and possibly reduce spending target of new nuclear power plant designs. Analysis methods and design must be employed to ensure that the systems perform their intended functions. [Purpose] This study aims to analyze the natural circulation of air inside the air cooling channel of molten salt-air heat exchanger in the nitrate natural circulation loop（NNCL）. [Methods] Numerical simulation was employed to study the heat transfer performance by the FLUNT6.3 software. Both the air velocity field and distribution of temperature field were studied to analyze the characteristics of flow fields inside the air-cooled channel of molten salt-air heat exchanger. [Results] The distribution graph of velocity field and temperature field under various operating conditions was made into charts and graphics. The transient distribution variation rules of different sections are obtained. The results are approximately consistent with the record summarized by optical fiber measurement. [Conclusions] The results show that the molten salt-air heat exchanger of air cooling channel can form good natural circulation and take away the heat. It provides a theoretical basis for the operation and transformation of the air-cooled channel.

关 键 词：硝酸盐自然循环回路 风冷通道 自然循环 计算流体动力学 

分 类 号：TL364[核科学技术—核技术及应用]